WO1997000749A1 - Improved hole cutting tools - Google Patents
Improved hole cutting tools Download PDFInfo
- Publication number
- WO1997000749A1 WO1997000749A1 PCT/US1996/008457 US9608457W WO9700749A1 WO 1997000749 A1 WO1997000749 A1 WO 1997000749A1 US 9608457 W US9608457 W US 9608457W WO 9700749 A1 WO9700749 A1 WO 9700749A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- teeth
- tooth
- group
- saw
- displaced
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/04—Drills for trepanning
- B23B51/0426—Drills for trepanning with centering devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/895—Having axial, core-receiving central portion
- Y10T408/8957—Having axial, core-receiving central portion and having stepped cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/896—Having product-receiving chamber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/905—Having stepped cutting edges
- Y10T408/906—Axially spaced
Definitions
- This invention relates to hole cutting tools and more particularly to such tools as include a rotatable cutter of cylindrical configuration having a repetitive saw tooth pattern disposed along the cutting edge thereof such that each tooth of the pattern is adapted to cut chips of uniform size.
- tools for cutting holes have generally included twist drill bits for holes of smaller diameter and auger bits for holes of larger diameter.
- spade bits and hole saws have generally replaced the auger in the larger diameter applications, with the hole saws usually bemg used for making holes larger than 1-inch in diameter and being adapted to be driven by a drill press or power drill.
- hole saws have become popular among those in the building trades, especially plumbers and electricians.
- hole saws have been almost universally manufactured with teeth of uniform height measured from a reference line disposed at a predetermined distance generally parallel to the back edge of the cylindrical cup and with one level of set.
- variable pitch in order to reduce vibration and a common tooth arrangement involved a five tooth group comprising: one raker, or unset tooth and at least four alternately set teeth and with all teeth being of the same height before the lateral setting thereof outwardly of opposite side surfaces of the cylindrical cutting tool.
- the teeth are of variable pitch in which the teeth first decrease and then increase in pitch and gullet depth.
- band saw blades and hole saws are important distinctions in the construction and operation of those two cutting tools.
- band saw blades and hole saws are important distinctions in the construction and operation of those two cutting tools.
- band saw blades and hole saws are important distinctions in the construction and operation of those two cutting tools.
- the planarity and flexibility of the former versus the cylindricality and rigidity of the latter; the linear motion of the former versus the rotational motion of the latter.
- Only a relatively small fraction of the teeth of a band saw are simultaneously engaged with the work being cut, whereas all the teeth of a hole saw are engaged with the work when cutting the same.
- Band saw blades, being of planar configuration are inherently sensitive to vibrations and lateral deviations or vibrations whereas hole saws which are of cylindrical construction, substantially greater rigidity and circumferential cutting motion are not inherently sensitive to lateral deviations or vibrations.
- each group starts with a raker tooth, thereafter there are invariably an equal number of alternately set teeth, such as four or six, which comprise oppositely set pairs of teeth.
- the leading pair of teeth are usually longer and have a lighter set than the trailing pair(s) which are generally shorter and have a heavier setting.
- these group features are considered important in minimizing vibration or wobble imparted to the teeth of the saw blade, they are invariably replicated throughout the cutting edge of the blade.
- Serial No. 08/408,847 was filed in the U.S. Patent and Trademark Office on March 23, 1995, which relates to a novel saw tooth arrangement for saws and particularly band saw blades.
- Cutting tools of cylindrical configuration are those in which one edge of the cylinder comprises repetitive groups of teeth.
- Each group of teeth comprises a plurality of individual teeth arranged in any order with respect to their height and the amount and direction of radial displacement.
- the teeth of each group may vary, for example, from an arrangement in which each of two set teeth may be radially displaced outwardly of opposite side surfaces of the cylindrical body of the tool.
- some predetermined portion of the number of set teeth in each group may be consecutively disposed along one side of the cylinder and the remainder of the teeth may be disposed consecutively along the other edge of the cylindrical body of the hole saw.
- the principal criterion is that the cutting edge of each tooth of the group be disposed in a surface of rotation, or revolution, different from that of the other teeth of the group. This construction is such that the cutting edge of each tooth is not masked nor eclipsed by the cutting edges of any preceding tooth of the group.
- Each of the teeth can therefore be said to have an accumulated pitch distance equal at least to the number of teeth in each group.
- FIG. 1 is a side elevational view of a hole saw, partly in section, of the type embodying this invention
- FIG. 2 is a sectional view taken along line 2-2 of FIG. 6, on a greatly enlarged scale, showing a preferred embodiment of this invention
- FIGS. 3-5 are views, on an enlarged scale, similar to FIG. 2 showing three alternate embodiments of this invention.
- FIG. 6 is a bottom plan view of the hole saw, on an enlarged scale, which shows the tooth group of FIG. 3;
- FIGS. 7 and 8 are sectional views, on an enlarged scale, as taken along line 7-7 of FIG. 9 and line 8-8 of FIG. 10 showing two further embodiments of this invention
- FIG. 9 is a bottom plan view of the hole saw having a tooth group as depicted in FIG. 7, and
- FIG. 10 is a view similar to FIG.9 of the tooth group, as depicted in FIG. 8.
- the cutting tool comprises a generally rigid metal cup 9, usually of tool steel having a closed end provided by a drive plate 10 (FIG. 6), adapted to be connected to an arbor 13 for interconnection to a drive plate 10 by means of a central opening 5 adapted to receive a drill bit 7 and two eccentrically spaced openings 17 adapted to receive drive pins extending from the arbor of a power drill or drill press, as disclosed in U.S. Patents No. 5,154,552 and No. 5,246,317, for example.
- a pilot drill bit extends outwardly of the cutting edge of the hole saw at the center of rotation thereof.
- the drill bit 7 serves to guide the hole saw into contact with the work and to maintain the hole saw in cutting orientation during the initial phase of the cutting operation.
- the outer edge portion of the cylindrical cup 9 is a saw tooth cutting edge 12 and which may comprise one of many and varied arrangements of saw teeth, as illustrated in a greatly enlarged scale in FIGS. 2-7.
- the cylindrical saw tooth edge portion of the cup 9 is further defined by an outer surface 11 and an inner surface 15 coaxial about its axis or geometric center x.
- the saw tooth edge 12 may include groups with an unset raker tooth 21 disposed in advance of the set teeth in the direction of rotation a (FIG. 1) of the cutting tool.
- the raker tooth 21 may be the same height as one or both pairs of set teeth, as illustrated respectively in FIGS. 2 and 3, or of greater height than both pairs of trailing teeth 22 and 23, as illustrated in FIG. 4.
- the raker tooth has a cutting edge 21' disposed in a surface of rotation or "cutting path" different than ali the other surfaces of revolution or “cutting paths” of the saw tooth group of the hole saw.
- FIG. 5 A hole saw is shown in FIG. 5 which is generally similar to that shown in FIG. 4, except that no raker tooth 21 is provided and, in addition, as shown the hole saw, may be provided with at least one additional tooth per group which may be radially displaced so that it will extend either from the inner or the outer surface 28 and 29, respectively, depending on its intended function.
- a single tooth, such as 28 in FIG. 5 may be provided in each group of teeth and which is disposed to extend inwardly of the inner surface 15 of the hole saw for facilitating removal of the cutout or plug p. (FIG. 1) from the hole saw.
- a tooth, as at 28, serves to finish the outer periphery to a smaller outer diameter than would otherwise be the case, so that the plug g. can be easily removed or will drop from the hole saw when it is cut through the work.
- hole saws manifest greater wear on the teeth that extend outwardly of the outer surface of the hole saw and it may therefore be desirable from the standpoint of improved wear life of the cutting edge to locate an extra tooth 29 as depicted in FIG. 5 in each group so that the extra tooth extends outwardly of the outer surface 11 of the hole saw as illustrated in FIG. 5. It will be realized by those skilled in the art that a single tooth of the type shown and described could also be included in any of the other groups of teeth shown in FIGS. 2-4, 7 and 8.
- each line 21'-25' is representative of a surface of rotation.
- the surface of rotation is an annulus whereas each of the other cutting teeth would have a cutting path, or surface of revo-lution of conical configuration.
- each conical cutting path is independent of each of the other cutting paths.
- set distance of the cutting edge of each of the first trailing teeth 22 and 23 of a four set tooth group is approximately 50% of the set distance of the each of the second trailing teeth 24 and 25.
- the significance of this relationship is that none of the cutting edges 22'-25' is preceded, or eclipsed by any other cutting edge movable in the same surface of rotation as that cutting edge.
- each of the teeth of the group has an accumulated pitch distance of five, whereby it will be understood that each tooth is adapted to cut the same size chips from the work.
- Each tooth of each recurrent group is therefore adapted to cut chips of generally uniform size, i.e., of equal depth and width and to cut such chips for approximately the same time without requiring excessive pecking movement of the cutter for periodic release of the chips.
- outwardly directed forces f (FIG. 6) on the inwardly displaced teeth 24 and inwardly directed forces f on outwardly displaced teeth 25, such as when they are impacting against the sides of a kerf formed in a workpiece being cut, tend to counterbalance each other.
- Such forces in combination with the structural rigidity of hole saws, are sufficient to stabilize such hole saws against lateral deviation, wobble or vibration, which are commonplace in planar type saws.
- each group of teeth comprises at least four teeth 22, 23, 24, 25 disposed in radially displaced relation on one or both sides of cylinder 9.
- the teeth 22-25 need not be arranged in pairs, as has been customary, nor placed on alternate sides of the group and can be in any order.
- the cutting edges of each tooth of the group is generally disposed in a surface of rotation separate and distinct from surfaces of rotation of the other cutting edges of the tooth in the group.
- FIGS. 7 and 9 Depicted in FIGS. 7 and 9 is an arrangement of a five tooth group comprising a raker tooth 21 and four radially displaced teeth 22-25, in which the lead teeth 22 and 23 are lower and more heavily set, while the higher and less widely displaced teeth 24 and 25 are in the trailing position relative to its direction of rotation of the hole saw.
- FIGS. 8 and 10 Shown in FIGS. 8 and 10, is a seven tooth group embodying this invention comprising a raker tooth 21 and six radially displaced teeth 22-27.
- the first teeth of the group i.e., 23, 25 and 27, all of which are displaced outwardly of the same side of the cylindrical outer surface 11 of the cylinder portion of the saw 8.
- the remaining three teeth, i.e., 22, 24 and 26, of that tooth group are all arranged similarly to the first three teeth set of the group, except that they are all displaced radially inward of the inner surface 15 of the cylinder 9, or of the hole saw 8.
- a raker tooth 21 may be optionally interposed between the last tooth 27 of the first set and the first tooth 22 of the second set of the group.
- the respective cutting edges 23', 25'-27' of each of the teeth identified by the same basic reference character, is defined as being disposed in the path of rotation or revolution as the hole saw rotates about its axis of rotation x ⁇
- the radial displacement of the cutting edge of the first tooth 22 of minimal displacement is approximately one-third, or 33% of the trailing tooth 26 of maximum displacement and the second trailing tooth 24 of medial displacement has a set distance of two-thirds or 67% of the tooth 26 of maximum displacement.
- the extent of radial displacement for each tooth of the five tooth group with two set teeth on each side of the hole saw is that each tooth of minimum or lesser radial displacement has a displacement of approximately one-half or 50% of the tooth of maximum displacement.
- standard hole saws were those having a variable pitch pattern of 4/6 teeth per inch (or per 2.54 cm) having teeth of equal height and a magnitude of set.
- the teeth included a leading raker tooth 21 followed by two lightly set teeth 22 and 23 of the same height as the raker before being set and thereafter, by two shorter and wider set trailing teeth 24 and 25.
- the first group involved hole saws of 2" in (5.08cm) diameter; the second 1.5"(3.81cm); and the third l"(2.54cm).
- the hole saws cut a JOO" workpiece of 304 stainless steel on a drill press operated at a cutting speed of 228 rpm feed force of 100 pounds (45.5kg) while using no lubricant.
- five improved and five standard hole saws were run for comparison of cutting time and wear life of both types of hole saws.
- both the standard and improved hole saws were run to failure.
- the improved hole saws showed remarkable improvement of approximately 50% in wear life and 36% in average cutting time over the standard hole saw.
- the 1-1/2" (3.81cm) and l"(2.54cm) diameter hole saws of both standard and improved type were both tested as above and the standard type were run to failure and for the improved hole saws, the testing was terminated after 50 cuts although, in all cases, the improved hole saws were still capable of further cutting. It was found in all three tests that hole saws embodying this invention had far superior wear life and faster cutting time than the standard hole saw. In fact, the average number of cuts of the improved hole saw was about 170% improvement over the standard hole saw and the cutting time of the improved cutter was 27% improvement over the standard cutter. Finally, the 1" (2.54cm) diameter hole saw, the average number of cuts of the improved product showed approximately a 400% improvement over the standard product and 34% improvement cutting time.
- the test results are tabulated as follows:
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9726771A GB2317841B (en) | 1995-06-20 | 1996-06-03 | Improved hole cutting tools |
DE19681464T DE19681464C2 (en) | 1995-06-20 | 1996-06-03 | Improved hole cutting tools |
AU59714/96A AU5971496A (en) | 1995-06-20 | 1996-06-03 | Improved hole cutting tools |
CA002223613A CA2223613C (en) | 1995-06-20 | 1996-06-03 | Improved hole cutting tool |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/492,801 | 1995-06-20 | ||
US08/492,801 US5803678A (en) | 1995-06-20 | 1995-06-20 | Hole cutting tools |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997000749A1 true WO1997000749A1 (en) | 1997-01-09 |
Family
ID=23957679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/008457 WO1997000749A1 (en) | 1995-06-20 | 1996-06-03 | Improved hole cutting tools |
Country Status (6)
Country | Link |
---|---|
US (1) | US5803678A (en) |
AU (1) | AU5971496A (en) |
CA (1) | CA2223613C (en) |
DE (1) | DE19681464C2 (en) |
GB (1) | GB2317841B (en) |
WO (1) | WO1997000749A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6322167B1 (en) * | 1996-12-11 | 2001-11-27 | Robert Bosch Gmbh | Process and device for controlling the braking force distribution in a vehicle |
US6588992B2 (en) | 2001-02-06 | 2003-07-08 | Black & Decker Inc. | Hole saw |
EP2987577A1 (en) * | 2014-08-08 | 2016-02-24 | wolfcraft GmbH | Hole saw |
WO2021089587A1 (en) * | 2019-11-04 | 2021-05-14 | Colt Technologies Gmbh | Cylindrical head boring tool, in particular a forstner bit |
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NL1006691C2 (en) * | 1997-07-30 | 1999-02-02 | Stork Mps Bv | Device for separating bone material from a meat piece. |
DE19739074B4 (en) * | 1997-09-08 | 2005-07-07 | WIKUS-Sägenfabrik Wilhelm H. Kullmann GmbH & Co. KG | Saw blade and method for its production |
US7036417B2 (en) | 2001-11-13 | 2006-05-02 | William George Alton | Bandsaw blade with cutting extensions |
US6939092B2 (en) * | 2003-06-18 | 2005-09-06 | Irwin Industrial Tool Company | Sheet metal hole cutter |
US8162967B1 (en) | 2003-10-16 | 2012-04-24 | Biomet Sports Medicine Llc | Method and apparatus for coring and reaming of bone |
US7225714B2 (en) * | 2004-12-22 | 2007-06-05 | Black & Decker Inc. | Tooth form design for reciprocating saw blade |
US7658136B2 (en) * | 2004-12-22 | 2010-02-09 | Black & Decker Inc. | Hole saw blade |
US20050211046A1 (en) * | 2004-03-26 | 2005-09-29 | Thomas Rickey J | Tooth form design for reciprocating saw blade |
USD527233S1 (en) | 2004-08-23 | 2006-08-29 | Irwin Industrial Tool Company | Colored reciprocating saw blade |
US7264428B2 (en) * | 2005-05-19 | 2007-09-04 | Irwin Industrial Tool Company | Hole saw and cutter |
US20070025827A1 (en) * | 2005-07-27 | 2007-02-01 | Pryor Steven E | Hollow self-drilling fastener |
US7637703B2 (en) | 2006-03-10 | 2009-12-29 | Milwaukee Electric Tool Corporation | Cutting tool |
US9724766B2 (en) | 2010-01-13 | 2017-08-08 | Irwin Industrial Tool Company | Hole cutter with multiple fulcrums |
US8573907B2 (en) * | 2010-01-13 | 2013-11-05 | Irwin Industrial Tool Company | Hole cutter with minimum tooth pitch to blade body thickness ratio |
US9586270B2 (en) | 2010-01-13 | 2017-03-07 | Irwin Industrial Tool Company | Coated hole cutter |
US10137507B2 (en) | 2010-01-13 | 2018-11-27 | Irwin Industrial Tool Company | Hole cutter with multiple fulcrums |
US9808869B2 (en) | 2010-01-13 | 2017-11-07 | Irwin Industrial Tool Company | Hole cutter with chip egress aperture |
USD690334S1 (en) | 2010-01-13 | 2013-09-24 | Irwin Industrial Tool Company | Hole saw |
US9884374B2 (en) | 2015-09-03 | 2018-02-06 | Irwin Industrial Tool Company | Hole cutter with multiple fulcrums |
US9782839B2 (en) | 2010-01-13 | 2017-10-10 | Irwin Industrial Tool Company | Hole cutter with chip egress aperture |
US8622665B2 (en) * | 2010-02-12 | 2014-01-07 | Robert Bosch Gmbh | Fast chip removal hole saw |
US10189099B2 (en) | 2010-04-22 | 2019-01-29 | Milwaukee Electric Tool Corporation | Saw Blade |
EP2564966B1 (en) | 2010-04-22 | 2017-04-12 | Milwaukee Electric Tool Corporation | Saw blade |
US20120093599A1 (en) * | 2010-10-14 | 2012-04-19 | Thomas Evatt | Cutting tool |
US8641718B2 (en) | 2010-10-19 | 2014-02-04 | Biomet Manufacturing, Llc | Method and apparatus for harvesting cartilage for treatment of a cartilage defect |
USD841417S1 (en) | 2011-04-22 | 2019-02-26 | Milwaukee Electric Tool Corporation | Saw blade |
JP5903345B2 (en) * | 2012-07-17 | 2016-04-13 | 株式会社アマダホールディングス | Optimum arrangement method of each tooth of saw blade and saw blade |
GB2558451B (en) | 2012-07-18 | 2018-09-19 | Milwaukee Electric Tool Corp | Toothform for a cutting tool, such as a hole saw |
US10940546B2 (en) * | 2016-04-19 | 2021-03-09 | The M.K. Morse Company | Ground set hole saw |
US10384273B2 (en) * | 2016-08-24 | 2019-08-20 | The M.K. Morse Company | Hole saw |
US10166612B2 (en) | 2016-08-26 | 2019-01-01 | Irwin Industrial Tool Company | Tooth formations and arrangement for a saw blade |
CN110650829A (en) | 2017-05-16 | 2020-01-03 | 米沃奇电动工具公司 | Saw blade |
US10537951B2 (en) | 2017-08-16 | 2020-01-21 | Black & Decker Inc. | Band saw blade for cutting structural workpieces |
USD845362S1 (en) | 2017-12-04 | 2019-04-09 | Black & Decker Inc. | Holesaw |
KR101898989B1 (en) * | 2018-04-03 | 2018-09-14 | 코리아에프에이(주) | Long holesaw for composite insulated panel |
CN110871295A (en) * | 2018-08-31 | 2020-03-10 | 博世电动工具(中国)有限公司 | Hole saw and device for making holes |
CN114728349A (en) | 2019-11-14 | 2022-07-08 | 米沃奇电动工具公司 | Hole saw with large carbide overhang |
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US3648508A (en) * | 1968-05-06 | 1972-03-14 | Everett D Hougen | Hole saw |
US3961858A (en) * | 1975-06-11 | 1976-06-08 | B&M Die Co., Inc. | Compound angle cutting edge |
US4827822A (en) * | 1985-04-03 | 1989-05-09 | Amada Company, Limited | Saw blade |
US5410935A (en) * | 1993-11-01 | 1995-05-02 | American Saw & Mfg. Company | Band saw blade |
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DE383221C (en) * | 1923-10-11 | Werner Paul | Disc cutter | |
GB557335A (en) * | 1942-06-03 | 1943-11-16 | Jacob Gruenberg | Annular boring tool |
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US3430526A (en) * | 1965-06-30 | 1969-03-04 | Interpace Corp | Shell cutter |
US3548687A (en) * | 1968-05-17 | 1970-12-22 | Madison Ind Inc | Trepanning drill tool |
US4813819A (en) * | 1982-09-27 | 1989-03-21 | Hougen Everett D | Method for cutting holes |
US4500234A (en) * | 1982-11-12 | 1985-02-19 | Waukesha Cutting Tools, Inc. | Trepanning tool |
JPS61109607A (en) * | 1984-11-01 | 1986-05-28 | Nitto Giken Kk | Annular cutter |
SE462523B (en) * | 1988-11-30 | 1990-07-09 | Sandvik Ab | SEAT AND DEVICE FOR GRINDING SAWS |
US4968192A (en) * | 1990-01-09 | 1990-11-06 | Hamilton Martin N | Trepanning tool |
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US5246317A (en) * | 1991-12-31 | 1993-09-21 | American Saw & Mfg. Company | Quick-release arbor for hole saws |
US5410936A (en) * | 1993-05-27 | 1995-05-02 | The 2Tek Corporation | Musical instrument bridge |
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1995
- 1995-06-20 US US08/492,801 patent/US5803678A/en not_active Expired - Lifetime
-
1996
- 1996-06-03 AU AU59714/96A patent/AU5971496A/en not_active Abandoned
- 1996-06-03 GB GB9726771A patent/GB2317841B/en not_active Expired - Lifetime
- 1996-06-03 WO PCT/US1996/008457 patent/WO1997000749A1/en active Application Filing
- 1996-06-03 DE DE19681464T patent/DE19681464C2/en not_active Expired - Lifetime
- 1996-06-03 CA CA002223613A patent/CA2223613C/en not_active Expired - Lifetime
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US3648508A (en) * | 1968-05-06 | 1972-03-14 | Everett D Hougen | Hole saw |
US3961858A (en) * | 1975-06-11 | 1976-06-08 | B&M Die Co., Inc. | Compound angle cutting edge |
US4827822A (en) * | 1985-04-03 | 1989-05-09 | Amada Company, Limited | Saw blade |
US5410935A (en) * | 1993-11-01 | 1995-05-02 | American Saw & Mfg. Company | Band saw blade |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6322167B1 (en) * | 1996-12-11 | 2001-11-27 | Robert Bosch Gmbh | Process and device for controlling the braking force distribution in a vehicle |
US6588992B2 (en) | 2001-02-06 | 2003-07-08 | Black & Decker Inc. | Hole saw |
EP2987577A1 (en) * | 2014-08-08 | 2016-02-24 | wolfcraft GmbH | Hole saw |
WO2021089587A1 (en) * | 2019-11-04 | 2021-05-14 | Colt Technologies Gmbh | Cylindrical head boring tool, in particular a forstner bit |
WO2021091373A2 (en) | 2019-11-04 | 2021-05-14 | Colt Technologies Gmbh | Cylindrical head boring tool, in particular a forstner bit |
WO2021091373A3 (en) * | 2019-11-04 | 2021-07-08 | Colt Technologies Gmbh | Cylindrical drill bit |
NL2024154B1 (en) * | 2019-11-04 | 2021-07-19 | Colt Tech Gmbh | Cylindrical head boring tool, in particular a Forstner bit |
CN114929445A (en) * | 2019-11-04 | 2022-08-19 | 科尔特技术有限责任公司 | Cylinder head drilling tool, in particular a Fosbury drill bit |
Also Published As
Publication number | Publication date |
---|---|
CA2223613C (en) | 2001-04-17 |
GB2317841B (en) | 1999-02-17 |
GB9726771D0 (en) | 1998-02-18 |
DE19681464C2 (en) | 2001-08-16 |
AU5971496A (en) | 1997-01-22 |
US5803678A (en) | 1998-09-08 |
DE19681464T1 (en) | 1999-04-01 |
GB2317841A (en) | 1998-04-08 |
CA2223613A1 (en) | 1997-01-09 |
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